Book Introduction
Puzzle 19 of Famous Buildings Medium Pack
Question is: Book Introduction
and the answer is: PREFACE
Word Meaning:
PREFACE — A beginning or introductory portion that comes before the main text of a document or book, typically serving to contextualize or explain the writing of the book and sometimes to acknowledge others' contributions; especially, such a discussion written by the work's own author.
Definitions from Wiktionary.